package main

import (
	"bytes"
	"fmt"
)

func main() {
	contents := "Good Year!"
	b1 := bytes.NewBufferString(contents)
	fmt.Printf("Lan: %d, Cap: %d.\n", b1.Len(), b1.Cap())
	n := 10
	b1.Grow(n)
	fmt.Printf("Lan: %d, Cap: %d.\n", b1.Len(), b1.Cap())
}